Why has Defra set up the zones as they have?
BTV is a notifiable disease and restricted zones around outbreaks are required and controlled by EU legislation. A 20km radius zone is put immediately around the infected holding, beyond that is another 80km Protection Zone (PZ), followed by a Surveillance Zone (SZ) of at least 50km. Within the total 150km zone, there are movement restrictions on livestock, carcases, semen and embryos to prevent transporting the virus to different parts of the country.
